gertjana · June 9, 2021 15:11
diff --git a/recursive_2.ex b/recursive_2.ex
  deltas = loop([], nil, measurements)

  defp loop(acc, _, []), do: acc
  defp loop(acc, nil, [head | tail]), do: loop(acc, head, tail)
  defp loop(acc, prev, [head | tail]) do
    diff = (head.value - prev.value) / diff_string_date(prev.date, head.date)
    loop([diff | acc], head, tail)
  end
	deltas = loop([], nil, measurements)

	defp loop(acc, _, []), do: acc
	defp loop(acc, nil, [head \| tail]), do: loop(acc, head, tail)
	defp loop(acc, prev, [head \| tail]) do
	diff = (head.value - prev.value) / diff_string_date(prev.date, head.date)
	loop([diff \| acc], head, tail)
	end